The treaty to limit the destruction of the ozone layer is hailed as the most successful environmental agreement of all time. Three decades on, the ozone layer is slowly but surely returning to health.

People gather outside the White House in Washington, D.C. on Thursday, June 1, 2017, to protest President Donald Trump’s decision to withdraw the United States from the Paris climate change accord.
AP Photo/Susan WalshJune 8, 2017

What the Montreal Protocol has done for the ozone hole threat other international accords could do for climate change – if we all agree.

Conventional wisdom says Barack Obama will hit political obstacles on the way to fulfilling his climate ambitions. But they might be easier to sidestep than you think,
EPA/Michael Reynolds/AAPAugust 18, 2015

Much has been made of the domestic political roadblocks between US President Barack Obama and climate action. But by using existing treaties he can get around the hostile Congress and help cut global emissions.

Scientists at the University of East Anglia have discovered new man-made gases that are contributing to the depletion of the Earth’s ozone layer. Three new Chlorofluorocarbons (CFCs), which act to destroy…